Radiochemical Approach to the JCO Criticality Accident in Tokai-mura, 1999 : An Overview of the Radiochemistry Group

A few days after the JCO criticality accident in Tokai-mura, a collaborating scientific investigation group was organized to evaluate the environmental impact of the accident. The group consisted of two groups: an environmental research group (radiochemistry group) and a biological research group. This paper overviews the scientific activity of the former group based on 6 sampling campaigns conducted at the JCO campus, Tokai-mura and Naka-machi. Some of the topical results and our remaining tasks concerning the JCO accident are discussed

High Resolution Simultaneous Measurements of Airborne Radionuclides at Sub-regional Sampling Points by Ultra Low Background Gamma Spectrometry

金沢大学環日本海域環境研究センター地球環境計測研究部門Promoting Environmental Pesearch in Pan-Japan Sea Area : Young Researchers\u27 Network, Schedule: March 8-10,2006,Kanazawa Excel Hotel Tokyu, Japan, Organized by: Kanazawa University 21st-Century COE Program, Environmental Monitoring and Prediction of Long- & Short- Term Dynamics of Pan-Japan Sea Area ; IICRC(Ishikawa International Cooperation Research Centre), Sponsors : Japan Sea Research ; UNU-IAS(United Nations University Institute of Advanced Studies)+Ishikawa Prefecture Government ; City of Kanazaw

天然・環境放射性核種の低エネルギー光子スペクトロメトリによる研究

金沢大学理学部研究課題/領域番号:X00080----247038研究期間(年度):1977 – 1978出典：「天然・環境放射性核種の低エネルギー光子スペクトロメトリによる研究」研究成果報告書　課題番号X00080----247038（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） （https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-X00080----247038/）を加工して作

High resolution simultaneous measurements of airborne radionuclides

金沢大学大学院自然科学研究科場所：東京大学弥生講堂，共催：文部科学省２１世紀COE「環日本海域の環境計測と長期・短期変動予測」，大気環境学

High resolution simultaneous measurements of airborne radionuclides

金沢大学大学院自然科学研究科場所：金沢大学自然科学研究科図書館棟1階，講演会場：図書館棟1階　大会議室，ポスター会場：図書館棟1階12会議室,主催・共催：文部科学省２１世紀COE「環日本海域の環境計測と長期・短期変動予測」， 大気環境学会， 金沢大学工学

Variation of environmental neutron flux with the depth of water and soil

金沢大学環日本海域環境研究センター金沢大学自然計測応用研究センター自然計測研究部門As a part of interest in the study of the neutron flux in biological environments, variations of slow neutrons with depth of water and soil were measured through the radioactivity induced in gold by 197Au(n,γ)198Au interaction. The measurements made for 0-100 cm in fresh water and 20-400 cm in sea water showed that the thermal neutron flux showed peak at around 10 cm depth and then gradually decreased with depth in water. The depth profiles in seawater were almost the same profile as freshwater. In the case of soil made for 0-60 cm, thermal neutron flux showed a peak at 5 cm then through a shoulder-like decrease during 10~30 cm range and decreased with depth gradually rapidly to 60 cm

Some Applications of the Gold Activation by Environmental Neutrons

金沢大学自然計測応用研究センター自然計測研究部門金沢大学環日本海域環境研究センターThe activation of gold by environmental neutrons was used to study the effect of concrete buildings at our laboratory (LLRL) on the neutron flux, and to estimate the thermal neutron flux in and around the building of Kinki University Training Reactor (UTR-Kinki). The results showed that three ceilings of thickness (34 g/cm2 each) decrease the fast neutrons to 26 %. However, the same reinforced concrete decreases the slow flux to only 62 %. On the other hand, the thermal neutron flux at 283m from the reactor center was two times higher than the environmental background. These results can give attention to the effect of concrete walls as a shielding around the reactors, especially those that have been hold near to the living environments